1. The act in buying a normal double cheeseburger off the dollar menu while substituting the ketchup for bigmac sauce and the chopped onions for sliced, then putting french fries in between the beef patties as if to be the middle bun in a big mac.
2. A big-mac made out of other mcdonald's food items resulting in almost the same thing but half the price.

The Urban Dictionary T-Shirt

1. The act in buying a normal double cheeseburger off the dollar menu while substituting the ketchup for bigmac sauce and the chopped onions for sliced, then putting french fries in between the beef patties as if to be the middle bun in a big mac.
2. A big-mac made out of other mcdonald's food items resulting in almost the same thing but half the price.